Novel 1-(2{40 -benzoyl eth-1{40 -yl)-2-(4{41 -cinnamyl piperazin-1{41 -yl methyl) benzimidazoles, their process of preparation and their therapeutic application

ABSTRACT

Compounds of the formula   IN WHICH Ar is phenyl optionally substituted by a halogen atom, by one or two methyl groups or by 1-4 carbon alkoxy groups are provided as novel therapeutic agents which have inter alia analgesic, vasodilatory, hypotensive, anticholinergic, spasmolytic, atropinic, gastric antisecretory, anti-ulcerous and diuretic properties.

United States Patent [1 1 Fauran et al.

1 Jan. 21, 1975 NOVEL l-(2-BENZOYL ETH-l'-YL)-2-(4"-CINNAMYL PIPERAZIN-l"-YL METHYL) BENZIMIDAZOLES, THEIR PROCESS OF PREPARATION AND THEIR THERAPEUTIC APPLICATION [75] Inventors: Claude P. Fauran, Paris; Jeannine A. Eberle, Chatou; Albert-Yves Le Cloarec, Saint-Maur; Nicole A. M. Dorme; Guy M. Raynaud, both of Paris, all of France [73] Assignee: Delalande S. A., Courbevoie (l-lauts de Seine), France [22] Filed: July 2, 1973 [21] Appl. No.: 376,135

[30] Foreign Application Priority Data July 6, 1972 France 72.24544 [52] US. Cl 260/240 K, 424/250, 260/293.8 [51] Int. Cl C07d 49/38 [58] Field of Search 260/240 J, 309.2, 240 K [56] References Cited UNITED STATES PATENTS 3,362,956 l/l968 Archer 260/240 K OTHER PUBLICATIONS Chemical Abstracts, Vol. 72, Abst. No. 11150621 (1970) (Abst. of German Offen. 1,933,179 published Feb. 5, 1970).

Primary ExaminerJohn D. Randolph Attorney, Agent, or FirmWoodhams, Blanchard and Flynn [57] ABSTRACT Compounds of the formula 6 Claims, No Drawings NOVEL l-(2-BENZOYL EXAMPLE ETH-l-YL)-2-(4"-CINNAMYL PIPERAZIN-l"-YL METHYL) BENZIMIDAZOLES, THEIR PROCESS OF PREPARATION AND THEIR THERAPEUTIC APPLICATION Code No: 7110 A mixture comprising 0.4 mol of 2-(4'-cinnamyl pip- The present invention relates to novel 1-(2-benzoyl eralm'l "3' methyl) benzimidazole mol of 1 -1' 2 4" i piperaziml methyl) piperidinomethyl acetophenone hydrochloride, 400 ml benzimidazoles, their process of preparation and their of ethanol and 400 ml Ofwater maintamed under therapeutic application. 10 flux for 7% hours. The precipitate formed is filtered, The novel Compounds in accordance with the present washed with water and then with ether. The precipitate invention corresponds to the general formula. formed is recrystallised from ethyl acetate, washed and filtered with petrol ether and recrystallised again from l-(2-benzoyl eth-l '-yl)-2-(4-cinnamyl piperazin-l-yl methyl) benzimidazole.

'7 i j Z ethyl acetate. 4 74-07,; 07 00 HR 5 i /'5 l/ l CHL' IV l\J-- I :3 f 3 u CH: CH- ar L 5 in which Ar represents a phenyl radical optionally sub- Melting point 123C stituted Yield 61% by a halogen atom, Empirical formula C H N 0 by one or two methyl groups, or Elementary analysis: by one or more alkoxy groups containing up to 4 car- C H N atoms- Calculated "/7 77.55 6.94 12.06 The process of preparation of the compounds in ac- Fou d "/1 7.41 H5 1228 cordance with the present invention consists in con densing, in a hydroalcoholic medium, 2-(4'-cinnamyl l-(2'-bcnZQy| 3 4' 1)-2.(4"- i pipcrazim piperazin-l -yl methyl) benzimidazole of formula: l"-yl methyl) benzimidazole dimaleate.

n I -J FT cu N a ct: on 11 i N 2 \a) 2 C with the hydrochloride ofa piperidinomethyl acetophe- By the addition of an ethanolic solution of 0.1 mol of none, optionally substituted in the benzene ring, of formaleic acid to an ethanolic solution of 0.05 mol of the mula: 40 base obtained above, the corresponding dimaleate is precipitated, which is then filtered and washed with ether. Qt- C119 CH CC Ar. "Cl (III) Melting point 177C Yield 90% Empirical formula C 1-1 N 0, 2C; H 0., wherein Ar is as defined above, with the elimination of Elementary analysisi piperidine hydrochloride. C H N T y P P '-y y bBIlZ- Calculated 65.50 5.79 2.04 imidazole of formula (II) is prepared by condensing 2- Found .5 5.85 8.22

. chloromethyl benzimidazole with cinnamylpiperazine.

The compounds listed in the following Table I have The following preparation is given by way of example been prepared according to the same method of operato illustrate the invention. tion.

TABLE 1-C0ntinued Ease c O .78.51 127C 52 7. 77.7917Qfs 1..71i 7s,sodi-a1ea:e c 710,76 172% as i. asso-5,95 7.62 65.59 base c 492,65 93: 37 z. 7s,o1 7.37 11.37 77 dinaleate c 2 72 3,78 137C 51 '7. 66,1. 6,12 73 we. base 6 524,6L 1 7m .3 7. 73,25 6.9; 10.65 73.1.", dimaleate c 756,73 122*0 51 63,): 3,86 7. 63,38

c 55,66 131C 4s 71,4 0,91 10,09 71 ,57"

786,81. .75% 9s "/1. 52m 1 536,69 109.5%: 50 4 m,c$7', .1 0J2 dimaleate 768,8 150c as 7. 65,65 6,2) 29 65,72 6,02.

The compounds of formula (I) have been tested on TABLE 111 la ra r v en shown to osammals m ho to and ha e be p Code No. of Dose Percentage inhibition analgeslc, vasodllatatoryt yp antl' Compound administered of bronchoconstriction cholinergic, spasmolyttc, atropinic, gastric anttsecretested g g/ r usndirti r ri. to y, anti ulcero a d u e c p ope tes 20 723' I00 7232 2.5 100 1. Analgesic properties 71376 5 The compounds of formula (I), administered by oral means to the mouse, are capable of reducing the number of painful stretchings caused by the intraperitoneal injection of acetic acid.

By way of example, the results obtained with different compounds of formula (I) are listed in the following Table 11.

TABLE 11 Code No. of Dose Percentage reduction Compound administered in number of painful tested (mg/kg/PO) stretchings 2. Vasodilatatory properties The compounds of formula (1) are capable of augmenting the flow of the coronary vessels of the isolated heart of a guinea-pig, when said compounds are added to the perfusion liquid of said organ.

By way of example, upon adding to the perfusion liquid of the isolated heart of a guinea-pig, the compound of Code No. 7110 in a concentration of 2.5 ug/ml, the flow of said organ is augmented by 80%.

3. Hypertensive properties Administered by intraveinous means to the anaesthetised rat, the compounds of formula (1) cause a lowering of the arterial pressure.

By way of example, the administration by intraveinous means of 2 mg/kg of the compound of Code No. 7231, cause a reduction of the arterial pressure of about 60% for 30 minutes.

4. Anticholinergic properties 5. Spasmolytic properties The compounds of formula (1), introduced in the conserving medium are capable of opposing the contractural action of barium chloride on the isolated duode'num of the rat.

By way of example, the spasmolytic activity of the compounds of Code Nos. 7231 and 71399, expressed by their DE 50, is 2.5 ug/ml and 3 ug/ml respectively.

6. Atropinic properties The compounds of formula (1), introduced in the conserving medium, are capable of opposing the contractural action of acetylcholine on the isolated duodenum of the rat.

By way of example, the atropinic activity of the compound of Code No. 7231, expressed by its DE 50, is 0.005 ug/ml.

TABLE IV Code No. of Dose Percentage reduction Compound administered of gastric secretion Tested (mg/kg/lD) TABLE V Code No. of Toxicity DE 50 DE 50 Compound tested (mg/kd/lD) (mg/kg/ID) DL 50 71110 DL 50: 1700 1 0.0006 7223 DL 0 2000 25 0.013 7231 DL 20: 2000 50 PRANTAL DL 50: 317 50 0.15

It can be seen from Table V that PRANTAL is clearly less active than the compound of Code No. 71 10, and less active than the compounds of Code Nos. 7231 and 7223.

8. Anti-ulcerous properties a. Reserpine ulcers: the compounds of formula (I) reduce the gastric ulcers caused by the intraperitoneal injection of reserpine.

By way of example, the DE 50 of the compound of Code No. 71 is 7 mg/kg/PO, and the results obtained by the administration of other compounds of formula (I) are given in the following Table VI:

TABLE VI Code No. of Dose administered Percentage reduction Compound (mg/kg/PO) of ulcers tested TABLE Vll Code No. of Dose administered Percentage reduction compound (mg/kg/PO) of constraint tested ulcers TABLE VIII Code No. of Dose administered Percentage reduction Compound (mg/kg/ID) of Shay ulcers tested 9. Diuretic properties The compounds of formula (I), administered by oral means to the mouse simultaneously with a volume of 1 ml of an isotonic solution of sodium chloride per 25g. of the corporeal weight of the mouse, are capable of provoking an augmentation of the volume of urine emitted by reference to control animals, the volume being measureed for 4 hours following administration.

By way of example, the administration of mg/kg/PO of the compound of Code No. 7231 augments the urinary elimination by 65%.

As can be seen by comparison of the results expressed above and the values shown in the following Table IX, the difference between the pharmacologically-active dose and the lethal dose is sufficiently great to permit the compounds of formula (I) to be utilized in therapeutics.

TABLE IX Code No. of Dose administered Percentage mortality compound (mg/kg/PO) tested 71 10 I700 50 7223 2000 t) 7231 2000 20 7232 2000 0 71399 2000 It) 71376 2000 0 The compounds of formula (I) are useful in the treatment of various pains. circulatory insufficiencies, hypertensions, visceral spasms, gastro-duodenal ulcers and oedemas.

They may be administered by oral means in the form of tablets, dragees and gelules containing 1 to 300 mg of active ingredient (1 to 5 times a day).

Accordingly, the present invention relates to a therapeutic composition comprising a compound of the general formula (I) together with a therapeuticallyacceptable carrier.

What we claim is:

1. A compound of the formula in which Ar represents a phenyl radical optionally substituted:

by a halogen atom,

by one or two methyl groups, or

by one or more alkoxy groups containing up to 4 carbon atoms.

2. A compound as claimed in claim 1, in which Ar represents a phenyl radical.

3. A compound as claimed in claim 1, in which Ar represents a p chlorophenyl or a p -fluorophenyl radica].

4. A compound as claimed in claim 1, in which Ar represents a p-tolyl radical or a 2,4-dimethylphenyl radical.

5. A compound as claimed in claim 1, in which Ar represents a 2,4-dimethoxyphenyl, a 3,4,5- trimethoxyphenyl or a n-butoxyphenyl radical.

6. A process for the preparation of a compound as claimed in claim 1 comprising condensing, in a hydroalcoholic medium 2-(4-cinnamyl piperazin-1'-yl methyl) benzimidazole of formula:

with the elimination of piperidine hydrochloride.

1k l i co Ar, n 01 (In) 

2. A compound as claimed in claim 1, in which Ar represents a phenyl radical.
 3. A compound as claimed in claim 1, in which Ar represents a p - chlorophenyl or a p -fluorophenyl radical.
 4. A compound as claimed in claim 1, in which Ar represents a p-tolyl radical or a 2,4-dimethylphenyl radical.
 5. A compound as claimed in claim 1, in which Ar represents a 2, 4-dimethoxyphenyl, a 3,4,5-trimethoxyphenyl or a n-butoxyphenyl radical.
 6. A process for the preparation of a compound as claimed in claim 1 comprising condensing, in a hydroalcoholic medium 2-(4''-cinnamyl piperazin-1''-yl methyl) benzimidazole of formula: 